package day4.Person;

public class TestPerson {
    public static void main(String[] args ){
        Person p1 = new Person();
        p1.setName("person1");
        p1.sayHello();
        Student s1 = new Student();
        s1.setName("student1");
        s1.sayHello();
        s1.age = 10;
    }

}
